Holder for commutator-brushes.



No. 839,522. PA'I'EIBT'ITED DEC. 25, 1906.

0. M. STIEGLER.

HOLDER FOR OOMMUTATOR BRUSHES.

APPLICATION FILED JULY 14. 1905.

Y tially shown.

UNITED sTA'rns OSCAR M. STIEGLER, OF BOSTON, MASSACHUSETTS.

HOLDER FOR COMMUTATOR-BRUSHES.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed July 14, 1905. Serial No. 269,639-

To all whom it may concern.-

Be it known that I, OSCAR M. STIEGLER, a citizen of the United States, residing at Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Holders for CommutatorBrushes, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention, relating to holders for commutator-brushes, has for its object the construction of a novel holder in which an adjustable pressure-arm holds the carbon-brush in its operative position against the commutator with any desired degree of pressure.

In my invention the brush is provided with a shoe that slides longitudinally in or on a brush-holder guide (shown as a loop or box) connected with a head or block suitably sustained outside the path of movement of the commutator in any usual or suitable manner.

WVith a holder embodying my invention the arm that presses the brush against the commutator acts directly on the shoe, and the brush may be instantly disconnected from the holder by turning said arm aside from its point of contact with the shoe.

Figure 1 in side elevation represents one of my novel holders with one end of the brush in contact with the commutator, but par- Fig. 2 is a section through the brush and some of its coacting parts in the line :0, Fig. 1. Fig. 3 shows the shoe detached. Fig. 4 is a view of the lower end of the shoe, Fig. 3; and Fig. 5 shows detached the contactstrip carried by the shoe and connecting the same with the usual head.

Referring to the drawings, A represents the usual metal head, provided with a hole that is fitted over the usual stud or device A, that sustains the head. The head has at one side a projection a, and opposite said projection the head presents two ears 2 3, through which is extended a screw or guide a, provided at a short distance from its head with screw-threads (see dotted lines, Fig. 1) that engage screw-threads in-the ear 2, the part of said screw that is passed through the hole in ear 3 being without threads, so that as the screw is turned the contact of the inner side of the head of the screw with ear 3 causes the head to be clamped firmly on the device A. The screw, as herein shown, is of a length to serve as a guide for the pressure-arm b, that acts, as will be described, to maintain the lower end of the brush or carbon C in contact with the commutator D, but partially shown, and which may be of any usual character.

The arm I) is provided with a hole and is bent upwardly at b in line with said hole, as shown, to form a seat for the thumb-nut d, shown as screwed onto the upper or armguiding end of said screw, the latter passing through the hole made in the bent part of said arm.

The outer left-hand end of arm I) (see Fig. 1) is upturned to form a convex portion 5. The ear 2 has attached to it by a screw 6 a yielding member 5 made as a bent spring that sustains the right-hand end of the arm I) nearer the seat 5.

The carbon-brush receives a suitable screw f by which to attach to the brush at its rear side a shoe The shoe is of metal and is bent to present a longitudinal ridge f, as

contact with and take seat against the rear side of the brush, leaving wings 8 of the shoe su'fliciently removed from the rear side of the brush to leave spaces to be entered by the lips 10 of the metal loop or box 9, that is secured to the projection a of the head A by suitable screws 13. The shoe bent as shown also presents lips 14, that contact with the inner sides of the loop or box g, the lips 14 of the shoe fitting the loop or box with sufiicient accuracy to insure that the shoe will be guided accurately by the loop or box and be free to be moved therein or thereover by the arm I) as the brush or commutator may wear away in use, said loop or box constituting what is hereinafter designated a guideway or shoe-guide.

The shoe has a projecting tongue f, the upper end of which is turned over forwardly or to the left, viewing Fig. 1, to present a rest f provided with side flanges 15. The convex part of the arm 1) contacts with the top of the rest f and the side flanges 15 prevent the arm from slipping off said rest. The head A is provided with a boss 20, on which rests the split end of the contact-strip l 21, the opposite end of which is secured to a shown in Fig. 4, said ridge being adapted to b will be placed upon the rest f of the shoe and the opposite end of the' arm on the yielding member b and by turning the nut d the pressure of the arm I) on the shoe and the pressure of the carbon on the commutator may be absolutely regulated. The end ll of the contact-strip 21'will be inserted between the nut 24 and the boss 20 and tightened.

' The invention is not limited to a construc- "t ion in which the screw (1 also acts as a guide for the arm.

It will be noticed that the arm 6 does not act directly upon the carbon.

I believe I am the first to provide a carbon with a shoe which fits a guideway, so that v the shoe carrying the carbon may be moved radially in the guideway with relation to the axis of the commutator, and hence this invention is not limited to the exact shape shown for the shoe or for the guideway. It will be understood that the shoe may be of any usual shape to fit any usualgroove forming part of any guideway. I

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is I 1. A holder for commutator-brushes comprising a head, a guideway secured thereto, a carbon exterior to the guideway, a shoe secured to the carbon and received within the guideway, a tongue projecting from said shoe and carrying a rest, an arm fulcrumed between its ends and bearing at one end on said rest, and a resilient member engaging the other end of said arm.

2. A holder for commutator-brushes comprising a head, a slotted guideway secured thereto, a carbon adjacent the slotted side of the guideway, a shoe secured to the carbon and received within the guideway, a tongue projecting from said shoe and carrying a rest, an arm fulcrumed intermediate its ends and bearing at one end on said rest, and a resilient member engaging the other end of said arm.

3. In a device of the class described, a split head adapted to be supported on a stud, a guideway carried by the head, a carbon having an attached shoe which cooperates with the guideway, a tongue projecting from said shoe and carrying a rest, an arm fulcrumed between its ends and having one end bearing on said rest, and a resilient member to engage the other end of the arm.

4. In a device of the class described, a split head adapted to embrace a stud, a clampingscrew projecting beyond the head and provided with an adjustable nut, a carbon movable with relation to the head, an arm to maintain the carbon in position, said arm bearing against said nut intermediate of its ends, and a resilient member for engaging the end of said arm.

5. In apparatus of the class described, a head, a hollow guideway sustained thereby, and a shoe slidable with relation to said guideway and provided with a rest having flanges, a carbon attached to the shoe, an arm having one end engaging said rest, an adjustable fulcrum for the arm intermediate of the ends thereof, and a resilient member engaging the other end of the arm.

6. In a holder for commutator-brushes, a head, a resilient member, a guideway, a shoe having a connected carbon and provided with a rest, a pivoted arm engaging said rest, said arm being separate from said resilient member and loosely resting thereon, and means to adjust the pressure of said arm on said carbon.

7. In apparatus of the class described, a shoe having a ridge to contact with one side of a carbon and provided with an extension having a rest.

8. In a device of the class described, a shoe shaped to present a longitudinally-ridged portion, and laterally-extended wings provided with lips said shoe being provided with an extension having a rest.

9. In a device of the class described, a guideway, combined with a shoe slidable thereover and. presenting laterally-extending wings having lips to engage the sides of the guideway.

10. In apparatus of the class described, a split head, a combined screw and arm-guide adapted to be rotated to close the split head, a guideway, a shoe slidable thereover, anarm held in position by said combined screw and guide, and means to control the extent of pressure of said arm on said shoe.

11. In a device of the class described, a slotted guideway formed of sheet metal, a carbon exterior to the guideway, said carbon engaging the slotted face of the guideway, a shoe attached to the carbon and having laterally-extending wings parallel to the face of the carbon and engaging the inner face of the slotted side of the guideway.

12. In a device of the class described, a slotted guideway formed of sheet metal, a carbon exterior to the guideway, said carbon engaging the slotted face of the guideway, a

shoe attached to the carbon and having 1atname to this specification in the presence of eiallyextendiig Wings papallel to tfbe tape {if two subscribing Witnesses. t e carbon an en a 'im t 1e inner ace 0 t e slotted side of the gi iidgivay, said Wings hav- 2 OSCAR STIEGLER ing lips at their edges to engage two opposite Witnesses: sides of the guideway. GEO. W. GREGORY,

In testimony whereof I have signed my BERTHA F. HENsER. 

